According to the New York Post, Cameron Douglas, who is currently serving time for drug charges, became a target after a New York mobster placed a $100 bounty on his head for co-operating with authorities and testifying against his two drug suppliers, illegal Mexican immigrants David and Eduardo Escalera, during their trial last year.

According to the Post, Douglas suffered the injuries in October and has undergone surgery to repair the damage he says was caused during a game of handball.

But a source suggests the troubled actor was hiding the real reason behind his injuries: "He broke his femur, which is hard to snap, and had to have a rod inserted. He told health services staff that he hurt them playing handball. You don't break a femur playing handball."

The insider adds, "They won't tolerate rats, and Cameron testified against the people who gave him the drugs."

The 34-year-old was ordered to serve five years behind bars for drug distribution and heroin possession, and last year he was handed an additional four-and-a-half-year term after he was caught smuggling heroin and Suboxone, a prescription medication used to dull the effects of opioid withdrawal, into prison.